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  2. Yanmar 2GM20 - Wikipedia

    en.wikipedia.org/wiki/Yanmar_2GM20

    It is a four-stroke, vertical, water-cooled diesel engine. It is built around two cylinders (hence the "2" in 2GM20) of 75 mm in diameter and 72 mm in stroke, adding up to 0.635 litres in displacement: each cylinder is roughly the size and volume of a 300 ml soft-drink can.

  3. Variable-pitch propeller (aeronautics) - Wikipedia

    en.wikipedia.org/wiki/Variable-pitch_propeller...

    Operation in a single engine reciprocating aircraft is as follows: Engine oil is pumped through the propeller shaft by the governor to push on a piston that drives the mechanism to change pitch. The flow of oil and the pitch are controlled by a governor, consisting of a gear type pump speeder spring, flyweights, and a pilot valve. The gear type ...

  4. Marine propulsion - Wikipedia

    en.wikipedia.org/wiki/Marine_propulsion

    Early steamships were fueled by wood, later ones by coal or fuel oil. Early ships used stern or side paddle wheels , which gave way to screw propellers . The first commercial success accrued to Robert Fulton 's North River Steamboat (often called Clermont ) in US in 1807, followed in Europe by the 45-foot (14 m) Comet of 1812.

  5. Ducted propeller - Wikipedia

    en.wikipedia.org/wiki/Ducted_propeller

    A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...

  6. Sterndrive - Wikipedia

    en.wikipedia.org/wiki/Sterndrive

    A sterndrive or inboard/outboard drive (I/O) is a form of marine propulsion which combines inboard power with outboard drive. The engine sits just forward of the transom while the drive unit ( outdrive or drive leg ) lies outside the hull .

  7. Variable-pitch propeller (marine) - Wikipedia

    en.wikipedia.org/wiki/Variable-pitch_propeller...

    In marine propulsion, a variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution.

  8. Propeller - Wikipedia

    en.wikipedia.org/wiki/Propeller

    A more serious problem with this type of propeller is a "frozen-on" spline bushing, which makes propeller removal impossible. In such cases the propeller must be heated in order to deliberately destroy the rubber insert. Once the propeller is removed, the splined tube can be cut away with a grinder and a new spline bushing is then required.

  9. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    The inboard boat motor firm of Caille Motor Company of Detroit were instrumental in making the cylinder and engines. The most successful early outboard motor, [ 16 ] was created by Norwegian-American inventor Ole Evinrude in 1909. [ 18 ]

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